Hopf reductions, fluxes and branes

Abstract

We use a series of reductions, T-dualities and liftings to construct connections between fractional brane solutions in IIA, IIB and M-theory. We find a number of phantom branes that are not supported by the geometry, however materialize upon untwisting and/or Hopf-reduction.

22 pages, harvmac; minor corrections, note added; Section 4 corrected; Powers of string coupling fixed, topology of the solution in section 4.1 clarified, to appear in Nucl.Phys.B

References in corpus (1)

• D6 branes and M theory geometrical transitions from gauged supergravity

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